From aedc6a95d4bf13ea86544e1f79632894733935a4 Mon Sep 17 00:00:00 2001
From: krizam <krishan@krizam.com>
Date: Fri, 30 Oct 2026 21:55:50 +0530
Subject: [PATCH] addd changes after testing completes

---
 compose.yml                     |   4 +-
 k6/mixed-workload.js            |   4 +
 results/endpoint-summary.json   | 263 ++++++++++++++++
 results/resource-monitor.log    | 514 ++++++++++++++++++++++++++++++++
 src/Sessions/sessions.routes.ts |  29 +-
 src/index.ts                    |  84 +++++-
 src/index.ts.bak                |  34 +++
 src/performance.ts              |  61 ++++
 yarn.lock                       |   6 +-
 9 files changed, 966 insertions(+), 33 deletions(-)
 create mode 100644 results/endpoint-summary.json
 create mode 100644 results/resource-monitor.log
 create mode 100644 src/index.ts.bak
 create mode 100644 src/performance.ts

diff --git a/compose.yml b/compose.yml
index 326ebbb..ebdb065 100644
--- a/compose.yml
+++ b/compose.yml
@@ -4,6 +4,8 @@ services:
     container_name: node-ass1-mongo
     restart: unless-stopped
     command: ["mongod", "--bind_ip_all"]
+    ports:
+      - "27017:27017" 
     environment:
       MONGO_INITDB_DATABASE: node_ass1
     volumes:
@@ -30,7 +32,7 @@ services:
     build:
       context: .
       dockerfile: Dockerfile
-    container_name: node-ass1-app
+    container_name: node-ass1
     init: true
     environment:
       NODE_ENV: production
diff --git a/k6/mixed-workload.js b/k6/mixed-workload.js
index 506ef6e..ebdbb1a 100644
--- a/k6/mixed-workload.js
+++ b/k6/mixed-workload.js
@@ -17,6 +17,10 @@ export const options = {
     { duration: '30s', target: 300 },
     { duration: '30s', target: 350 },
     { duration: '30s', target: 400 },
+    { duration: '30s', target: 450 },
+    { duration: '30s', target: 500 },
+    { duration: '30s', target: 550 },
+    { duration: '30s', target: 600 },
     { duration: '20s', target: 0 },
   ],
   thresholds: {
diff --git a/results/endpoint-summary.json b/results/endpoint-summary.json
new file mode 100644
index 0000000..d61c5ff
--- /dev/null
+++ b/results/endpoint-summary.json
@@ -0,0 +1,263 @@
+{
+  "root_group": {
+    "name": "",
+    "path": "",
+    "id": "d41d8cd98f00b204e9800998ecf8427e",
+    "groups": [],
+    "checks": [
+        {
+          "name": "user inserted (201)",
+          "path": "::user inserted (201)",
+          "id": "61138958708e4a2b69cbce12b5dba379",
+          "passes": 42391,
+          "fails": 0
+        },
+        {
+          "passes": 42391,
+          "fails": 0,
+          "name": "session inserted (201)",
+          "path": "::session inserted (201)",
+          "id": "0b7502855f7a14c6b8ae3c7e5fcd6180"
+        },
+        {
+          "passes": 42391,
+          "fails": 0,
+          "name": "session booked (200)",
+          "path": "::session booked (200)",
+          "id": "6122a02dda129a636cbdfffbd456ed0e"
+        },
+        {
+          "path": "::session completed (200)",
+          "id": "d62f54aa0d5a0860474a82997b18199d",
+          "passes": 42391,
+          "fails": 0,
+          "name": "session completed (200)"
+        },
+        {
+          "path": "::user history returned (200)",
+          "id": "be27adf881c2a4e5780c7c52e1e27b18",
+          "passes": 42391,
+          "fails": 0,
+          "name": "user history returned (200)"
+        }
+      ]
+  },
+  "options": {
+    "summaryTrendStats": [
+      "avg",
+      "min",
+      "med",
+      "max",
+      "p(90)",
+      "p(95)"
+    ],
+    "summaryTimeUnit": "",
+    "noColor": false
+  },
+  "state": {
+    "isStdOutTTY": true,
+    "isStdErrTTY": true,
+    "testRunDurationMs": 360906.175981
+  },
+  "metrics": {
+    "http_req_blocked": {
+      "type": "trend",
+      "contains": "time",
+      "values": {
+        "min": 0.001748,
+        "med": 0.005039,
+        "max": 83.516915,
+        "p(90)": 0.007351,
+        "p(95)": 0.012784299999999988,
+        "avg": 0.00804504491991221
+      }
+    },
+    "http_req_waiting": {
+      "type": "trend",
+      "contains": "time",
+      "values": {
+        "p(90)": 631.7170610000002,
+        "p(95)": 756.3328154999999,
+        "avg": 335.2043564318419,
+        "min": 1.461087,
+        "med": 298.901892,
+        "max": 1723.065966
+      }
+    },
+    "http_req_failed": {
+      "thresholds": {
+        "rate<0.02": {
+          "ok": true
+        }
+      },
+      "type": "rate",
+      "contains": "default",
+      "values": {
+        "rate": 0,
+        "passes": 0,
+        "fails": 211955
+      }
+    },
+    "vus_max": {
+      "type": "gauge",
+      "contains": "default",
+      "values": {
+        "value": 600,
+        "min": 392,
+        "max": 600
+      }
+    },
+    "data_sent": {
+      "type": "counter",
+      "contains": "data",
+      "values": {
+        "count": 38544706,
+        "rate": 106799.79608337098
+      }
+    },
+    "http_req_duration": {
+      "values": {
+        "med": 299.00709,
+        "max": 1723.149674,
+        "p(90)": 631.8264,
+        "p(95)": 756.4324386999998,
+        "avg": 335.3095546191911,
+        "min": 1.550369
+      },
+      "thresholds": {
+        "p(95)<500": {
+          "ok": false
+        }
+      },
+      "type": "trend",
+      "contains": "time"
+    },
+    "vus": {
+      "type": "gauge",
+      "contains": "default",
+      "values": {
+        "value": 15,
+        "min": 0,
+        "max": 599
+      }
+    },
+    "checks": {
+      "type": "rate",
+      "contains": "default",
+      "values": {
+        "fails": 0,
+        "rate": 1,
+        "passes": 211955
+      }
+    },
+    "iteration_duration": {
+      "type": "trend",
+      "contains": "time",
+      "values": {
+        "p(95)": 4179.962574,
+        "avg": 2678.407575923359,
+        "min": 1011.81574,
+        "med": 2562.419432,
+        "max": 6506.905764,
+        "p(90)": 3953.131088
+      }
+    },
+    "http_req_receiving": {
+      "type": "trend",
+      "contains": "time",
+      "values": {
+        "min": 0.016061,
+        "med": 0.061433,
+        "max": 64.720787,
+        "p(90)": 0.0904586,
+        "p(95)": 0.12308759999999998,
+        "avg": 0.07331172284211289
+      }
+    },
+    "http_reqs": {
+      "type": "counter",
+      "contains": "default",
+      "values": {
+        "count": 211955,
+        "rate": 587.285599709877
+      }
+    },
+    "iterations": {
+      "type": "counter",
+      "contains": "default",
+      "values": {
+        "count": 42391,
+        "rate": 117.4571199419754
+      }
+    },
+    "write_failures": {
+      "type": "counter",
+      "contains": "default",
+      "values": {
+        "rate": 0,
+        "count": 0
+      },
+      "thresholds": {
+        "count==0": {
+          "ok": true
+        }
+      }
+    },
+    "http_req_sending": {
+      "type": "trend",
+      "contains": "time",
+      "values": {
+        "p(90)": 0.03411620000000001,
+        "p(95)": 0.054261299999999985,
+        "avg": 0.03188646451369477,
+        "min": 0.004979,
+        "med": 0.019274,
+        "max": 29.576928
+      }
+    },
+    "data_received": {
+      "type": "counter",
+      "contains": "data",
+      "values": {
+        "count": 122733232,
+        "rate": 340069.63628813415
+      }
+    },
+    "http_req_connecting": {
+      "type": "trend",
+      "contains": "time",
+      "values": {
+        "min": 0,
+        "med": 0,
+        "max": 10.53803,
+        "p(90)": 0,
+        "p(95)": 0,
+        "avg": 0.0012284992238918632
+      }
+    },
+    "http_req_tls_handshaking": {
+      "values": {
+        "p(90)": 0,
+        "p(95)": 0,
+        "avg": 0,
+        "min": 0,
+        "med": 0,
+        "max": 0
+      },
+      "type": "trend",
+      "contains": "time"
+    },
+    "http_req_duration{expected_response:true}": {
+      "type": "trend",
+      "contains": "time",
+      "values": {
+        "max": 1723.149674,
+        "p(90)": 631.8264,
+        "p(95)": 756.4324386999998,
+        "avg": 335.3095546191911,
+        "min": 1.550369,
+        "med": 299.00709
+      }
+    }
+  }
+}
\ No newline at end of file
diff --git a/results/resource-monitor.log b/results/resource-monitor.log
new file mode 100644
index 0000000..8d0f289
--- /dev/null
+++ b/results/resource-monitor.log
@@ -0,0 +1,514 @@
+08:00:57
+node-ass1-app CPU=126.14% MEM=79.48MiB / 1GiB
+node-ass1-mongo CPU=45.24% MEM=302.3MiB / 2GiB
+08:01:05
+node-ass1-app CPU=130.33% MEM=79.47MiB / 1GiB
+node-ass1-mongo CPU=45.73% MEM=306.3MiB / 2GiB
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diff --git a/src/Sessions/sessions.routes.ts b/src/Sessions/sessions.routes.ts
index 372c19f..a75b2fd 100644
--- a/src/Sessions/sessions.routes.ts
+++ b/src/Sessions/sessions.routes.ts
@@ -2,6 +2,7 @@ import express from 'express';
 import Sessions from './Schema/sessions.schema.js'
 import Teachers from '../Teachers/Schema/Teachers.schema.js';
 import { Types } from 'mongoose';
+import { measureDb } from '../performance.js';
 
 const SessionsRoutes = express.Router();
 
@@ -11,9 +12,8 @@ SessionsRoutes.post('/', async (req, res) => {
   const { teacherId, startTime, endTime } = req.body;
 
   //Check for teacher existance
-  const existingTeacher = await Teachers.findOne({ _id: teacherId });
+  const existingTeacher = await measureDb('sessions.create.checkTeacher', () => Teachers.findOne({ _id: teacherId }));
 
-  console.log('existingTeacher', existingTeacher)
   if (!existingTeacher) {
     return res.status(400).send({ message: 'Teacher Does not exist please provide valid teacherId.' })
   }
@@ -24,7 +24,7 @@ SessionsRoutes.post('/', async (req, res) => {
   }
 
   const newSession = new Sessions({ teacherId, startTime, endTime });
-  const result = await newSession.save();
+  const result = await measureDb('sessions.create.insert', () => newSession.save());
 
   if (result) {
     return res.status(201).send({ message: 'Session Added Successfully', result })
@@ -42,7 +42,7 @@ SessionsRoutes.get('/available', async (req: any, res) => {
   const startOfDay = new Date(`${dateString}T00:00:00.000Z`);
   const endOfDay = new Date(`${dateString}T23:59:59.999Z`);
 
-  const availableSessions = await Sessions.aggregate([
+  const availableSessions = await measureDb('sessions.available.aggregate', () => Sessions.aggregate([
     {
       $match: {
         startTime: { $lte: endOfDay },
@@ -50,7 +50,7 @@ SessionsRoutes.get('/available', async (req: any, res) => {
         status: "AVAILABLE",
       }
     }
-  ]);
+  ]));
 
   return res.status(200).send({ message: 'Available Session', availableSessions })
 
@@ -78,7 +78,6 @@ SessionsRoutes.get('/available', async (req: any, res) => {
 //         { new: true }
 //     );
 //
-//     // console.log('re-------', result)
 //
 //     if(result?.status === 'BOOKED') {
 //         return res.status(200).send({message: 'Session Booked', result})
@@ -96,7 +95,7 @@ SessionsRoutes.post('/:id/book', async (req: any, res) => {
   const { userId } = req.body;
 
   // Atomically book only if the session is still AVAILABLE
-  const result = await Sessions.findOneAndUpdate(
+  const result = await measureDb('sessions.book.update', () => Sessions.findOneAndUpdate(
     { _id: id, status: 'AVAILABLE' },
     {
       $set: {
@@ -108,7 +107,7 @@ SessionsRoutes.post('/:id/book', async (req: any, res) => {
       new: true,
       runValidators: true
     }
-  );
+  ));
 
   if (result) {
     return res.status(200).send({
@@ -118,7 +117,7 @@ SessionsRoutes.post('/:id/book', async (req: any, res) => {
   }
 
   // Determine why the booking failed
-  const existingSession = await Sessions.findById(id);
+  const existingSession = await measureDb('sessions.book.failureLookup', () => Sessions.findById(id));
 
   if (!existingSession) {
     return res.status(400).send({
@@ -135,7 +134,7 @@ SessionsRoutes.patch('/:id/complete', async (req: any, res) => {
 
   const { id } = req.params;
 
-  const existingSession = await Sessions.findOne({ _id: id, });
+  const existingSession = await measureDb('sessions.complete.find', () => Sessions.findOne({ _id: id }));
 
   if (!existingSession) {
     return res.status(400).send({ message: 'Session does not exist.' })
@@ -144,13 +143,12 @@ SessionsRoutes.patch('/:id/complete', async (req: any, res) => {
     return res.status(400).send({ message: 'This session is not BOOKED' });
   }
 
-  const result = await Sessions.findByIdAndUpdate(
+  const result = await measureDb('sessions.complete.update', () => Sessions.findByIdAndUpdate(
     id,
     { status: "COMPLETED", completedAt: Date.now() },
     { new: true }
-  );
+  ));
 
-  // console.log('re-------', result)
 
   if (result?.status === 'COMPLETED') {
     return res.status(200).send({ message: 'Session Marked Completed', result })
@@ -167,9 +165,8 @@ SessionsRoutes.patch('/:id/complete', async (req: any, res) => {
 SessionsRoutes.get('/:id/sessions', async (req, res) => {
 
   let userId = new Types.ObjectId(req.params.id);
-  console.log('userId', userId)
 
-  const result = await Sessions.aggregate([
+  const result = await measureDb('sessions.history.aggregate', () => Sessions.aggregate([
     {
       $match: {
         userId: userId
@@ -193,7 +190,7 @@ SessionsRoutes.get('/:id/sessions', async (req, res) => {
         ]
       }
     }
-  ]);
+  ]));
 
   res.status(200).json({
     success: true,
diff --git a/src/index.ts b/src/index.ts
index 8b4a9ef..e916cf5 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,13 +1,47 @@
 import express from "express";
-import 'dotenv/config'
+import 'dotenv/config';
 import mongoose from "mongoose";
+import { monitorEventLoopDelay, performance } from "node:perf_hooks";
 
-import TeachersRoutes from './Teachers/teachers.routes.js'
+import TeachersRoutes from './Teachers/teachers.routes.js';
 import UsersRoutes from "./Users/users.routes.js";
 import SessionsRoutes from "./Sessions/sessions.routes.js";
 
 const app = express();
 const PORT = 3000;
+const MONGO_URI = process.env.MONGO_URI!;
+
+const eventLoop = monitorEventLoopDelay({ resolution: 20 });
+eventLoop.enable();
+
+const requestMetrics = new Map<string, {
+  count: number;
+  totalMs: number;
+  maxMs: number;
+  over500Ms: number;
+}>();
+
+app.use((req, res, next) => {
+  const started = performance.now();
+
+  res.on("finish", () => {
+    const durationMs = performance.now() - started;
+    const key = `${req.method} ${req.route?.path ?? req.path} ${res.statusCode}`;
+
+    let metric = requestMetrics.get(key);
+    if (!metric) {
+      metric = { count: 0, totalMs: 0, maxMs: 0, over500Ms: 0 };
+      requestMetrics.set(key, metric);
+    }
+
+    metric.count++;
+    metric.totalMs += durationMs;
+    metric.maxMs = Math.max(metric.maxMs, durationMs);
+    if (durationMs > 500) metric.over500Ms++;
+  });
+
+  next();
+});
 
 app.use(express.json());
 
@@ -15,20 +49,44 @@ app.get("/", (_req, res) => {
   res.json({ message: "Hello from Express + TypeScript!" });
 });
 
-const MONGO_URI = process.env.MONGO_URI!;
-
-// Users
 app.use('/users', UsersRoutes);
-
-// Teachers
 app.use('/teachers', TeachersRoutes);
-
-
-// Sessions
 app.use('/sessions', SessionsRoutes);
 
+setInterval(() => {
+  const requests = Object.fromEntries(
+    [...requestMetrics.entries()].map(([key, value]) => [
+      key,
+      {
+        count: value.count,
+        avgMs: Number((value.totalMs / value.count).toFixed(2)),
+        maxMs: Number(value.maxMs.toFixed(2)),
+        over500Ms: value.over500Ms,
+      },
+    ]),
+  );
 
-app.listen(PORT, async() => {
-  console.log(`Server running at http://localhost:${PORT}`);
-  await mongoose.connect(MONGO_URI);
+  console.log(JSON.stringify({
+    type: "performance_summary",
+    timestamp: new Date().toISOString(),
+    requests,
+    eventLoopDelayMs: {
+      mean: Number((eventLoop.mean / 1e6 || 0).toFixed(2)),
+      p95: Number((eventLoop.percentile(95) / 1e6).toFixed(2)),
+      max: Number((eventLoop.max / 1e6).toFixed(2)),
+    },
+  }));
+
+  requestMetrics.clear();
+  eventLoop.reset();
+}, 10_000).unref();
+
+app.listen(PORT, async () => {
+  try {
+    await mongoose.connect(MONGO_URI);
+    console.log(`Server running at http://localhost:${PORT}`);
+  } catch (error) {
+    console.error("MongoDB connection failed:", error);
+    process.exit(1);
+  }
 });
diff --git a/src/index.ts.bak b/src/index.ts.bak
new file mode 100644
index 0000000..8b4a9ef
--- /dev/null
+++ b/src/index.ts.bak
@@ -0,0 +1,34 @@
+import express from "express";
+import 'dotenv/config'
+import mongoose from "mongoose";
+
+import TeachersRoutes from './Teachers/teachers.routes.js'
+import UsersRoutes from "./Users/users.routes.js";
+import SessionsRoutes from "./Sessions/sessions.routes.js";
+
+const app = express();
+const PORT = 3000;
+
+app.use(express.json());
+
+app.get("/", (_req, res) => {
+  res.json({ message: "Hello from Express + TypeScript!" });
+});
+
+const MONGO_URI = process.env.MONGO_URI!;
+
+// Users
+app.use('/users', UsersRoutes);
+
+// Teachers
+app.use('/teachers', TeachersRoutes);
+
+
+// Sessions
+app.use('/sessions', SessionsRoutes);
+
+
+app.listen(PORT, async() => {
+  console.log(`Server running at http://localhost:${PORT}`);
+  await mongoose.connect(MONGO_URI);
+});
diff --git a/src/performance.ts b/src/performance.ts
new file mode 100644
index 0000000..bfbde2c
--- /dev/null
+++ b/src/performance.ts
@@ -0,0 +1,61 @@
+import { performance } from "node:perf_hooks";
+
+type DbMetric = {
+  count: number;
+  totalMs: number;
+  maxMs: number;
+  over100Ms: number;
+};
+
+const metrics = new Map<string, DbMetric>();
+
+export async function measureDb<T>(
+  label: string,
+  operation: () => Promise<T>,
+): Promise<T> {
+  const started = performance.now();
+
+  try {
+    return await operation();
+  } finally {
+    const durationMs = performance.now() - started;
+
+    let metric = metrics.get(label);
+    if (!metric) {
+      metric = { count: 0, totalMs: 0, maxMs: 0, over100Ms: 0 };
+      metrics.set(label, metric);
+    }
+
+    metric.count++;
+    metric.totalMs += durationMs;
+    metric.maxMs = Math.max(metric.maxMs, durationMs);
+
+    if (durationMs > 100) {
+      metric.over100Ms++;
+    }
+  }
+}
+
+setInterval(() => {
+  if (metrics.size === 0) return;
+
+  const operations = Object.fromEntries(
+    [...metrics.entries()].map(([label, metric]) => [
+      label,
+      {
+        count: metric.count,
+        avgMs: Number((metric.totalMs / metric.count).toFixed(2)),
+        maxMs: Number(metric.maxMs.toFixed(2)),
+        over100Ms: metric.over100Ms,
+      },
+    ]),
+  );
+
+  console.log(JSON.stringify({
+    type: "database_performance",
+    timestamp: new Date().toISOString(),
+    operations,
+  }));
+
+  metrics.clear();
+}, 10_000).unref();
diff --git a/yarn.lock b/yarn.lock
index 28cc217..d280fae 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -408,7 +408,7 @@ depd@^2.0.0, depd@~2.0.0:
   resolved "https://registry.yarnpkg.com/depd/-/depd-2.0.0.tgz#b696163cc757560d09cf22cc8fad1571b79e76df"
   integrity sha512-g7nH6P6dyDioJogAAGprGpCtVImJhpPk/roCzdb3fIh61/s/nPsfR6onyMwkCAR/OlC3yBC0lESvUoQEAssIrw==
 
-dotenv@^18.0.8:
+dotenv@18.0.8:
   version "18.0.8"
   resolved "https://registry.yarnpkg.com/dotenv/-/dotenv-18.0.8.tgz#e51b1e4424d73df5e17802954dc503aaa565bd1a"
   integrity sha512-2KDeoFoK/zRtcnbunCDlLG5VWVMcyqeQc6iK65o231nfNAcuGrKoqUQfJFUtBI+QlShk5HKIHxwebBtUl3rEfA==
@@ -491,7 +491,7 @@ etag@^1.8.1:
   resolved "https://registry.yarnpkg.com/etag/-/etag-1.8.1.tgz#41ae2eeb65efa62268aebfea83ac7d79299b0887"
   integrity sha512-aIL5Fx7mawVa300al2BnEE4iNvo1qETxLrPI/o05L7z6go7fCw1J6EQmbK4FmJ2AS7kgVF/KEZWufBfdClMcPg==
 
-express@^5.3.0:
+express@5.3.0:
   version "5.3.0"
   resolved "https://registry.yarnpkg.com/express/-/express-5.3.0.tgz#ab72dace89c50c8417bd3f865dad0b4fd1ca1c73"
   integrity sha512-qCqy1xSoaugxOD4IVHb1ZWdkvCF2W3aE2okKouWj8VwJ+ztskSiXoBnCSJqfKT+cVPJhuJqe9YLbY425+Zh00g==
@@ -685,7 +685,7 @@ mongodb@~7.7:
     bson "^7.3.2"
     mongodb-connection-string-url "^7.0.2"
 
-mongoose@^9.11.2:
+mongoose@9.11.2:
   version "9.11.2"
   resolved "https://registry.yarnpkg.com/mongoose/-/mongoose-9.11.2.tgz#4df6a5cf6ea6a571433cde3f9ba8bd4b1bb2dfd3"
   integrity sha512-hFkl/2dccpD58coRAya3a/ht8ooAx9YPLzBfxVX9bEsgcrjsNkvuWQe8gplGfDdmzpw2RfFX1IB/G8PiFwyvwg==